@book { DasGeheimnisvonHerculaneum,
    title = "Das Geheimnis von Herculaneum",
    author = "Ilona {Bulazel}",
    year = "2021",
    publisher = "via tolino media",
    address = "München, Deutschland",
    url = "https://tolino.openpublishing.com/document/1001248"
}